dataTransformations.js

//array of objects to array of values
var arr = [{val: 'foo'}, {val: 'bar'}];
arr = arr.map((item) => {
    return item.val;
}); 
console.log(arr) // ['foo', 'bar']


// reversing string
var str = 'abcde'
str = str.split('').reverse().join('');
console.log(str) // 'edcba'


//using map/reduce
const programmerOutput = [
  {
    name: 'Uncle Bobby',
    linesOfCode: 500
  }, {
    name: 'Suzie Q',
    linesOfCode: 1500
  }
];

const INITIAL_VALUE = 0;

const totalOutput = programmerOutput
  .map((programmer) => programmer.linesOfCode)
  .reduce((acc, linesOfCode) => acc + linesOfCode, INITIAL_VALUE);